From 475d6f98804c09a48b5c815f7bd466fb4c1e743e Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Mon, 23 Aug 2021 17:13:48 +0200 Subject: [PATCH] ksmbd: fix translation in smb2_populate_readdir_entry() When transferring ownership information to the client the k*ids are translated into raw *ids before they are sent over the wire. The function currently erroneously translates the k*ids according to the mount's idmapping. Instead, reporting the owning *ids to userspace the underlying k*ids need to be mapped up in the caller's user namespace. This is how stat() works. The caller in this instance is ksmbd itself and ksmbd always runs in the initial user namespace. Translate according to that. The idmapping of the mount is already taken into account by the lower filesystem and so kstat->*id will contain the mapped k*ids. Switch to from_k*id_munged() which ensures that the overflow*id is returned instead of the (*id_t)-1 when the k*id can't be translated. Cc: Steve French Cc: Christoph Hellwig Cc: Namjae Jeon Cc: Hyunchul Lee Cc: Sergey Senozhatsky Cc: linux-cifs@vger.kernel.org Signed-off-by: Christian Brauner Signed-off-by: Namjae Jeon Signed-off-by: Steve French --- fs/ksmbd/smb2pdu.c | 6 ++---- fs/ksmbd/smb_common.c | 4 +--- fs/ksmbd/smb_common.h | 1 - 3 files changed, 3 insertions(+), 8 deletions(-) diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c index a400dd292af1..559bfa2623f2 100644 --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -3324,7 +3324,6 @@ static int dentry_name(struct ksmbd_dir_info *d_info, int info_level) */ static int smb2_populate_readdir_entry(struct ksmbd_conn *conn, int info_level, struct ksmbd_dir_info *d_info, - struct user_namespace *user_ns, struct ksmbd_kstat *ksmbd_kstat) { int next_entry_offset = 0; @@ -3478,9 +3477,9 @@ static int smb2_populate_readdir_entry(struct ksmbd_conn *conn, int info_level, S_ISDIR(ksmbd_kstat->kstat->mode) ? ATTR_DIRECTORY_LE : ATTR_ARCHIVE_LE; if (d_info->hide_dot_file && d_info->name[0] == '.') posix_info->DosAttributes |= ATTR_HIDDEN_LE; - id_to_sid(from_kuid(user_ns, ksmbd_kstat->kstat->uid), + id_to_sid(from_kuid_munged(&init_user_ns, ksmbd_kstat->kstat->uid), SIDNFS_USER, (struct smb_sid *)&posix_info->SidBuffer[0]); - id_to_sid(from_kgid(user_ns, ksmbd_kstat->kstat->gid), + id_to_sid(from_kgid_munged(&init_user_ns, ksmbd_kstat->kstat->gid), SIDNFS_GROUP, (struct smb_sid *)&posix_info->SidBuffer[20]); memcpy(posix_info->name, conv_name, conv_len); posix_info->name_len = cpu_to_le32(conv_len); @@ -3571,7 +3570,6 @@ static int process_query_dir_entries(struct smb2_query_dir_private *priv) rc = smb2_populate_readdir_entry(priv->work->conn, priv->info_level, priv->d_info, - user_ns, &ksmbd_kstat); dput(dent); if (rc) diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c index b108b918ec84..43d3123d8b62 100644 --- a/fs/ksmbd/smb_common.c +++ b/fs/ksmbd/smb_common.c @@ -291,7 +291,6 @@ int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level, char *search_pattern, int (*fn)(struct ksmbd_conn *, int, struct ksmbd_dir_info *, - struct user_namespace *, struct ksmbd_kstat *)) { int i, rc = 0; @@ -322,8 +321,7 @@ int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level, user_ns, dir->filp->f_path.dentry->d_parent, &ksmbd_kstat); - rc = fn(conn, info_level, d_info, - user_ns, &ksmbd_kstat); + rc = fn(conn, info_level, d_info, &ksmbd_kstat); if (rc) break; if (d_info->out_buf_len <= 0) diff --git a/fs/ksmbd/smb_common.h b/fs/ksmbd/smb_common.h index eb667d85558e..57c667c1be06 100644 --- a/fs/ksmbd/smb_common.h +++ b/fs/ksmbd/smb_common.h @@ -511,7 +511,6 @@ int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int (*fn)(struct ksmbd_conn *, int, struct ksmbd_dir_info *, - struct user_namespace *, struct ksmbd_kstat *)); int ksmbd_extract_shortname(struct ksmbd_conn *conn,